r/aws_sns_topic: Add support of prefixes

aws/resource_aws_sns_topic.go

@@ -9,6 +9,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/service/sns"
 	"github.com/hashicorp/errwrap"
+	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/hashicorp/terraform/helper/schema"
 )
 
@@ -32,8 +33,15 @@ func resourceAwsSnsTopic() *schema.Resource {
 
 		Schema: map[string]*schema.Schema{
 			"name": &schema.Schema{
+				Type:          schema.TypeString,
+				Optional:      true,
+				Computed:      true,
+				ForceNew:      true,
+				ConflictsWith: []string{"name_prefix"},
+			},
+			"name_prefix": &schema.Schema{
 				Type:     schema.TypeString,
-				Required: true,
+				Optional: true,
 				ForceNew: true,
 			},
 			"display_name": &schema.Schema{
@@ -74,7 +82,14 @@ func resourceAwsSnsTopic() *schema.Resource {
 func resourceAwsSnsTopicCreate(d *schema.ResourceData, meta interface{}) error {
 	snsconn := meta.(*AWSClient).snsconn
 
-	name := d.Get("name").(string)
+	var name string
+	if v, ok := d.GetOk("name"); ok {
+		name = v.(string)
+	} else if v, ok := d.GetOk("name_prefix"); ok {
+		name = resource.PrefixedUniqueId(v.(string))
+	} else {
+		name = resource.UniqueId()
+	}
 
 	log.Printf("[DEBUG] SNS create topic: %s", name)
 

aws/resource_aws_sns_topic_test.go

@@ -33,6 +33,26 @@ func TestAccAWSSNSTopic_basic(t *testing.T) {
 	})
 }
 
+func TestAccAWSSNSTopic_prefix(t *testing.T) {
+	startsWithPrefix := regexp.MustCompile("^terraform-test-topic-")
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:      func() { testAccPreCheck(t) },
+		IDRefreshName: "aws_sns_topic.test_topic",
+		Providers:     testAccProviders,
+		CheckDestroy:  testAccCheckAWSSNSTopicDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccAWSSNSTopicConfig_withPrefix(),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSSNSTopicExists("aws_sns_topic.test_topic"),
+					resource.TestMatchResourceAttr("aws_sns_topic.test_topic", "name", startsWithPrefix),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAWSSNSTopic_policy(t *testing.T) {
 	rName := acctest.RandString(10)
 	expectedPolicy := `{"Statement":[{"Sid":"Stmt1445931846145","Effect":"Allow","Principal":{"AWS":"*"},"Action":"sns:Publish","Resource":"arn:aws:sns:us-west-2::example"}],"Version":"2012-10-17","Id":"Policy1445931846145"}`
@@ -258,6 +278,14 @@ resource "aws_sns_topic" "test_topic" {
 `, r)
 }
 
+func testAccAWSSNSTopicConfig_withPrefix() string {
+	return `
+resource "aws_sns_topic" "test_topic" {
+    name_prefix = "terraform-test-topic-"
+}
+`
+}
+
 func testAccAWSSNSTopicWithPolicy(r string) string {
 	return fmt.Sprintf(`
 resource "aws_sns_topic" "test_topic" {

website/docs/r/sns_topic.html.markdown

@@ -22,7 +22,8 @@ resource "aws_sns_topic" "user_updates" {
 
 The following arguments are supported:
 
-* `name` - (Required) The friendly name for the SNS topic
+* `name` - (Optional) The friendly name for the SNS topic. By default generated by Terraform.
+* `name_prefix` - (Optional) The friendly name for the SNS topic. Conflicts with `name`.
 * `display_name` - (Optional) The display name for the SNS topic
 * `policy` - (Optional) The fully-formed AWS policy as JSON
 * `delivery_policy` - (Optional) The SNS delivery policy
@@ -40,4 +41,4 @@ SNS Topics can be imported using the `topic arn`, e.g.
 
 ```
 $ terraform import aws_sns_topic.user_updates arn:aws:sns:us-west-2:0123456789012:my-topic
-```
+```